Writing instrument



FIG. 1 is a front, right perspective view of a writing instrument, with the writing tip extended, showing my new design;

FIG. 2 is a front, right perspective view thereof with the grip portion in an alternate, twisted state;

FIG. 3 is a front elevational view of FIG. 1;

FIG. 4 is a rear elevational view of FIG. 1;

FIG. 5 is a right side elevational view of FIG. 1;

FIG. 6 is a left side elevational view of FIG. 1;

FIG. 7 is a top plan view of FIG. 1; and,

FIG. 8 is a bottom plan view of FIG. 1. 

The ornamental design for a writing instrument, as shown and described. 